CN112735274A - Display module and preparation method thereof - Google Patents

Fig. 1 is a schematic cross-sectional view of a side display device in the prior art, which generally includes a

130 having a curved side surface, and a

110 is attached to the inner side of the

130 through an optical

120 to form a side display area. However, in the conventional design, before the bonding, the outer edge of the optical

120 is integrally retracted by 150 microns compared with the outer edge of the

110, that is, as shown in fig. 2, after the bonding is completed, due to the influence of the bonding tolerance and a certain degree of misalignment after bending, the outer edge of the

110 is suspended outside the outer edge of the optical

120 in the prepared display device, and the suspension distance d is greater than 150 microns. Then, concentrated stress is generated at the edge of the

110, especially at the bending angle, and the display panel is easily cracked due to the excessive stress, thereby greatly reducing the reliability of the display device.

a

210, specifically referring to fig. 3, the

210 includes a

211, and a

212 adjacent to and outside a side of the

211, the

212 is curved in a direction away from a light emitting surface of the

211 to form a convex curved surface for displaying, the

212 includes a

2122 and a

2121, the

2121 is located at two ends of the

2122, wherein an outer edge of the

2121 is curved along with the curve of the

212, and an outer edge of the

2122 is not curved;

the transparent

220 is attached to a side surface of the

210 in the light emitting direction, specifically referring to fig. 4, wherein the transparent

220 is made of an Optically Clear Adhesive (OCA); and

a

230 attached to a side surface of the transparent

220 away from the

210 and completely covering the

210, wherein the

230 includes a planar cover surface corresponding to the

211 and a curved cover surface corresponding to the

212, that is, the display panel is attached to a concave side surface of the

230 through the transparent

220;

the cross section along the direction L1 in fig. 3 is formed as shown in fig. 4, that is, the cross section at the position of the

2121 is as shown in fig. 4, where the outer edge of the

2121 is located within the range of the transparent

220, that is, the

2121 is completely attached to the

230 through the transparent

220, and along the bending direction of the

2121, the outer edge of the transparent

220 is more extended than the outer edge of the

2121, so as to avoid the problem of stress concentration at the suspension portion and further cracking at the suspension portion caused by the suspension of the

2121 beyond the edge of the transparent

220 in the prior art, thereby greatly improving the reliability of the display module.

It is understood that, in the above embodiment, the

211 is generally rectangular, the

212 is connected outside the side edge of the

211, and according to the actual display requirement, 1 to 4

212 may be provided, for example, a double curved display or a four curved display which is currently studied is available, the above embodiment only exemplarily shows a case where two

212 are provided outside the opposite side edges of the

211, and a person skilled in the art can apply to other cases according to the description of the above embodiment, which is not limited by the present invention.

In some embodiments, with continued reference to fig. 4, a distance d1 between the outer edge of the

2121 and the outer edge of the transparent

220 is less than or equal to 100 μm, where the distance d1 refers to a distance that the outer edge of the transparent

220 exceeds the outer edge of the

2121, and the distance d1 should not be too large, otherwise too much of the transparent

220 is exposed, which may cause other defects.

In some embodiments, at a position corresponding to the

2121, the outer edge of the transparent

220 is arc-shaped, for example, it may be arc-shaped, elliptical arc-shaped, or multi-segment arc-shaped, and a specific schematic diagram thereof will be described in detail in the embodiments described later.

In some embodiments, it has been verified that the stress of the

2122 is lower than that of the

2121, so that the outer edges of the

2122 do not need to be disposed within the transparent

220, and other problems caused by the excessive exposed transparent

220 are avoided. Specifically, the cross-section along the direction L2 in fig. 3 forms the structure shown in fig. 5, that is, the cross-sectional structure at the position of the

2122 is shown in fig. 5, where the outer edge of the

2122 is located outside the range of the transparent

220, that is, along the bending direction of the

2122, the outer edge of the

2122 is more extended than the outer edge of the transparent

220, and the transparent

220 completely covers the

2122.

Further, referring to fig. 5, a distance d2 between an outer edge of the

2122 and an outer edge of the transparent

220 is less than or equal to 100 micrometers, where the distance d2 refers to a distance that the outer edge of the

2122 exceeds the outer edge of the transparent

220, and compared with a distance greater than 150 micrometers in the prior art, a hanging amount of the side display region in the attached display panel is not too large to cause cracks, and the exposure of the transparent adhesive layer is not bad.

s01: providing a

210, and referring to fig. 7a, the

210 includes a

211, and a

212 connected to the outside of the side of the

211, the

212 includes a

2121 and a

2122, the

2122 is located at two ends of the

2121;

s02: providing a transparent

220, which has a structure shown in fig. 7b, including a planar

221 corresponding to the

211 and a curved

222 corresponding to the

212, and attaching the two regions to the side of the

210 in the light-emitting direction in an aligned manner, i.e., forming a structure shown in fig. 7c, after attaching, making the outer edge of the

2121 within the range of the transparent

220, i.e., the transparent

220 completely covers the

2121; and

s03: providing a

230, the structure of which is shown in fig. 7d, including a

231 corresponding to the

211 and a

232 corresponding to the

212, attaching the cover plate to the side of the transparent

220 away from the

210, and completely covering the

210, i.e. forming the structure shown in fig. 7e, specifically, fig. 7e shows the cross-sectional structure along the direction L1 in fig. 7c, since the outer edge of the

2121 is located in the range of the transparent

220 in step S02, in the prepared display module, the outer edge of the transparent

220 is more extended than the outer edge of the

2121, so as to avoid the problem of cracking caused by stress concentration at the suspended portion due to the

2121 being suspended outside the edge of the transparent

220 in the prior art, thereby greatly improving the reliability of the display module.

Further, with reference to fig. 7c, in the step S02, a distance a between the outer edge of the

2121 and the outer edge of the transparent

220 is less than or equal to 100 micrometers, and a certain degree of misalignment may occur due to the influence of the fitting tolerance and after bending, where the distance a is within the above range, so that a distance d1 between the outer edge of the bent

2121 and the outer edge of the transparent

220 is within a predetermined target range, thereby ensuring that the corner display region in the display panel is not suspended outside the edge of the transparent adhesive layer to cause cracks, and avoiding the occurrence of defects due to too much exposed transparent adhesive layer.

In some embodiments, it is verified that the stress of the

2122 is smaller than that of the

2121, so that the outer edges of the

2122 do not need to be disposed within the transparent

220, and other problems caused by the excessive exposed transparent

220 are avoided. Therefore, in the step S02, the outer edge of the

2122 is located outside the range of the

220, i.e. as shown in fig. 7 c. At this time, with continuing reference to fig. 7e, the cross-sectional structure of fig. 7c along the direction L1, i.e. the cross-sectional structure of the

2122, along the bending direction of the

2122, the outer edges of the

2122 are more extended than the outer edges of the

220, and the

2122 completely cover the

220.

Further, with reference to fig. 7c, in the step S02, a distance b between an outer edge of the

2122 and an outer edge of the transparent

220 is greater than or equal to 50 micrometers and less than or equal to 100 micrometers, and a certain degree of misalignment may occur due to the influence of the fitting tolerance and after bending, where the distance b is within the above range, so that a distance d2 between the outer edge of the

2122 and the outer edge of the transparent

220 after bending is within a predetermined target range, thereby ensuring that the side display region in the display panel is not cracked due to too large suspension amount, and avoiding the transparent adhesive layer from being exposed to be bad.

1. The utility model provides a display module assembly, its characterized in that, display module assembly includes:

the display panel comprises a plane display area and a curved surface display area adjacent to the plane display area, wherein the curved surface display area comprises a side display area and a corner display area;

the transparent adhesive layer is attached to the side face of the light emergent direction of the display panel; and

the cover plate is attached to the side face, far away from the display panel, of the transparent adhesive layer and completely covers the display panel;

wherein the outer edge of the corner display region is located within the transparent glue layer.

2. The display module of claim 1, wherein a distance between an outer edge of the corner display region and an outer edge of the clear adhesive layer is 100 microns or less.

3. The display module according to claim 1, wherein the outer edge of the transparent adhesive layer at the position corresponding to the corner display area is circular arc, elliptical arc or multi-segment circular arc.

4. The display module of claim 1, wherein in the display panel, the outer edge of the side display region is outside the range of the transparent glue layer.

5. The display module of claim 4, wherein a distance between an outer edge of the side display region and an outer edge of the transparent glue layer is 100 microns or less.

6. A preparation method of a display module is characterized by comprising the following steps:

s01: providing a display panel, wherein the display panel comprises a plane display area and a curved surface display area connected with the plane display area, and the curved surface display area comprises a side display area and a corner display area;

s02: providing a transparent adhesive layer, and attaching the transparent adhesive layer to the side surface of the display panel in the light emergent direction, so that the outer edge of the corner display area is positioned in the range of the transparent adhesive layer; and

s03: and providing a cover plate, fitting the side face of the transparent adhesive layer far away from the display panel and completely covering the display panel.

7. The method for manufacturing a display module according to claim 6, wherein a distance between an outer edge of the corner display region and an outer edge of the transparent adhesive layer is 100 μm or less.

8. The method for manufacturing a display module according to claim 6, wherein the outer edge of the transparent adhesive layer is arc-shaped, elliptical arc-shaped, or multi-segment arc-shaped at the position corresponding to the corner display region.

9. The method for manufacturing a display module according to claim 6, wherein in the step S02, the outer edge of the side display region is located outside the range of the transparent adhesive layer.

10. The method for manufacturing a display module according to claim 9, wherein a distance between an outer edge of the side display region and an outer edge of the transparent adhesive layer is greater than or equal to 50 micrometers and less than or equal to 100 micrometers.